A travelling microscope is used to determine the refractive index of a glass slab. If 40 divisions a

Question

A travelling microscope is used to determine the refractive index of a glass slab. If 40 divisions are there in 1 cm on main scale and 50 Vernier scale divisions are equal to 49 main scale divisions, then least count of the travelling microscope is : ________ $	imes 10^{-6} \mathrm{~m}$.\

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(5)\